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I bought a house two years ago. There is a really nice deck on the whole back of the house. I don't think it has ever been sealed though, since I moved in I have noticed the color changing to a light gray color and the nails are starting to pop up and sink in. What do I need to get to finish the deck? I don't want to change the color at all just seal it so the water stays out. I bought some deck clear sealant but it turned the test area alot darker. And what do I need to do if anything to prep the deck before the application? Any help would be great.

You should first clean the deck thoroughly. Go to the home center and buy a product made specifically for cleaning decks. After it is cleaned then let it dry thoroughly. Then apply a deck sealer with UV protection.

I agree with the post. I bought an inexpensive pressure washer , Karcher , and used a cleaner before I sealed it. I will clen it this year as there is still a little dirt and green stuff that has shown up this year. The pressure washer takes some getting used to since you can leave uneven patterns , I did but the learning curve is good.